The article focuses on Old Slavonic versions of Euthalian chapter-lists to Acts and Epistles considering meta-communicative terms, such as παραίνεσις or προοίμιον. The author aims to evaluate the level of accuracy of Slavonic translations and their exegetical potential, which makes the content of the main text of Acts and Epistles clear. The analysis reveals two tendencies prevailing in Slavonic sources from the 12th–16th centuries: first, there are phenomena of lexical variability, as results of applying various translation strategies, more or less successful in terms of the accuracy and clarity of the resulting text (calques, periphrastic constructions, and text expansion). Second, there is a tendency towards unification, suggesting a universal Slavonic term for several Greek correlates. Authoritative dictionaries, including academic ones, do not record some lexemes. There is no dependence of the chapter-lists lexicon on the main text vocabulary.